Question about 1988 Honda Accord 4 Door

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Headlights are draining my battery. i replaced the alternator because i noticed a severe drain, my cars radio cut out and my engine almost quit. after installing the new alt. everything seemed fine until the weather dictated the need 4 headlights. the car ran fine untill the battery got very low under 11v. at home i performed some diagnostics disconnected all amp wires, turned radio off and headlights. checked the voltage the alt was doing its job battery charging and read 14.5v at idle. reconnected the amp power and retested with radio on cranking; minimal drain. it read 14.2v. turned on headlights voltage droped to 11 and falling. turned the lights off voltage shot right back up. whats goin on?

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Sounds like you have a shorted wire somewhere.

Posted on Jun 28, 2009

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Increase the size of the wire on back of alt, to battery.

Posted on Jun 28, 2009

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What's draining my battery?


1: Faulty Battery: inspect and fill it with distilled water, if needed: battery may be shorted out

2: Alternator: the voltage regulator inside alternator will drain battery when it quits working: break unit open, and replace the regulator: or replace the entire unit with a rebuilt alternator.

3: Loose alternator belt, which slips and does not allow for enough revolutions to fully charge the battery - especially at night-time, when you are running your headlights and such.

Now, to do a test, which will tell you if the alternator has failed, in 10 minutes:

1) Simply loosen, but Do Not Remove, the battery post clamps / cables, from battery.

2) Start Engine.

3) With engine running, REMOVE both cables from battery posts (engine should continue to run) (if it does not / dies out upon removal of cables, then test no further): ensure to secure the positive post cable - wrap it with a rag, or set it on cardboard or rubber, so it does not ground: then reach inside, and turn ON your headlights: upon doing so, and highlights are ignited, if the engine dies out - if the engine quits running the instant you turn your lights on, with the battery cable disconnected off - that means that the alternator is Not Charging; that it is not producing enough current to run itself / maintain itself running / maintain the engine running; so it does not produce enough electricity to keep your battery fully charged - and, is in fact, draining your battery of any available current which was stored in it.

So, more likely then not, it's the electronic regulator / diode stored inside of the large alternator unit: but, because, your car is a 1990, the brushes on your alternator are shot anyway; so you are better off just replacing the whole unit and belt: and battery if need be.

I hope this helps somewhat: where, with ENGINE RUNNING at normal / higher idle speed, and BATTERY DISCONNECTED, and ACCESSORIES RUNNING, especially headlights and heater - the Engine Must Remain ON / Running - on solely alternator power.

In that: the battery is only required to start the car; stored energy / current for the purpose of starting the car, as supplied by the alternator - and adjusted by the regulator: a faulty regulator will fry your battery, by over-charging / allowing too much electricity to flow.

Good Luck,

Ray

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Sounds like the alternator is still not making the correct voltage to charge the fully. The battery light comes on when the alternator doesn't make enough voltage to charge it. Your alternator might still be charging, but not putting out required voltage. I would have your alternator & battery tested. Hope this helps you.

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